Litter pan



FIG. 1 is a front perspective view of a litter pan in accordance with our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof,

FIG. 6 is a front view thereof, and,

FIG. 7 is a back view thereof.

The broken lines depict environmental subject matter, are for illustration only, and form no part of the claimed design. 

CLAIM The ornamental design for a litter pan, as shown and described. 